Patent CS-200578-B1 (CS)
Title: Method of finishing webs,especially textile fabrics
Inventor: HEGER ADOLF
IPC: C08J7/00
Filed: 1974-05-14
Abstract: 1462505 Irradiation grafting process TEXTILKOMBINAT COTTBUS VEB 14 May 1974 [15 May 1973] 21345/74 Heading C3G Textile planar products are finished by a process in which the product is (a) homogeneously irradiated by means of ionizing rays and homogeneously contacted with a monomer, before, during or after the homogeneous irradiation and (b) thereupon subjected to locally limited ionizing irradiation with ionizing rays and homogeneously contacted with a monomer, or homogeneously irradiated with ionizing rays and brought into contact, with local limitations, with means which destroy the radicals formed and homogeneously contacted with a monomer. Step (b) may precede step (a). In a modification, the planar product is homogeneously irradiated and simultaneously or subsequently subjected to locally limited ionizing irradiation, followed by homogeneous contacting with a monomer. The means for destroying radicals with local limitations may be heated profiled rollers or controlled laser beams. Examples are given in which the ionizing rays are produced from an electron accelerator and (a) polyamide silk is irradiated, passed through aqueous acrylic acid, irradiated with part of the ray field masked by perforated aluminium discs, passed through aqueous acrylamide and treated with sodium ions; (b) polypropylene film is irradiated, passed through an aqueous acrylamide/acrylic acid solution, optionally irradiated again, and then passed over a heated profiled roller and treated with aqueous acrylic acid; (c) cotton/polyamide material is irradiated, passed through methanolic styrene solution, irradiated again, treated with controlled laser beams and grafted a second time using said styrene solution; (d) polyamide/polyester fabric is impregnated with aqueous acrylic acid, irradiated first homogeneously and then with a controlled electron beam and then treated with aqueous acrylic acid; (e) polyacrylonitrile/polyamide fleece is impregnated with methyl methacrylate, subjected to homogeneous irradiation and then passed over a heated profiled roller prior to treatment with methanolic styrene solution; (f) polyacrylonitrile/polyester fabric is irradiated under a masking stencil, treated with styrene vapour, homogeneously irradiated and then treated with alcoholic styrene; (g) cotton/polypropylene fleece is irradiated under an aluminium patterned masking stencil, treated with boiling aqueous acrylic acid, homogeneously irradiated and then treated again with said boiling aqueous acid; (h) polyamide foil is irradiated under a masking stencil, treated with aqueous acrylamide, rinsed, treated with aqueous acrylic acid and then homogeneously irradiated; (i) polyamide fibrous floor covering is irradiated, passed over a heated profiled roller, contacted with boiling aqueous acrylic acid, homogeneously irradiated and then treated with sodium ions and dyed; (i) polyester fabric is irradiated, passed over heated profiled rollers, treated with boiling aqueous acrylic acid, rinsed, impregnated with aqueous acrylamide and subjected to homogeneous irradiation; (k) polyamide silk is irradiated, passed through aqueous acrylic acid, passed over a heated profiled roller, contacted with acrylamide solution and irradiated; (1) fibrous polyamide/polyester material is irradiated first homogeneously and then under aluminium stencils and contacted with aqueous acrylamide; (m) polyamide/polyester material is homogeneously irradiated, passed over a heated profiled roller, further irradiated and then contacted with aqueous acrylamide and (n) polyamide/ polyester material is irradiated in a homogeneous ray field under a masking stencil of thickness smaller than the length of the rays applied and then contacted with acrylamide solution.